Sinus Lifting and Leucocyte- and Platelet-Rich Fibrin

The insufficient alveolar bone height due to the maxillary sinus in the posterior maxilla and postextraction bone resorption may limit implant placement. The sinus lifting procedure creates space between the maxillary alveolar bone and the Schneiderian membrane, which is filled with graft materials to maintain adequate space for new bone formation. Leucocyte- and platelet-rich fibrin (L-PRF)-mixed bone substitute or L-PRF has been used solely as a graft material for sinus lifting. The clinical and radiological findings of the application of PRF for sinus augmentation have been shown to have good results regarding new bone formation. The L-PRF can be an efficient biomaterial for graft particles in maxillary sinus lifting

Modeling and control of high density microcantilever systems

In this thesis we build on our earlier work on the control of high density, electrostatically actuated microcantilever arrays and present simple state feedback controllers that can achieve reasonable performance. These controllers are localized, spatially distributed and yield tracking performances comparable to the performance of the more complex H infinity controller that takes disturbances and couplings into account, for reference frequencies as high as 3000 rad/sec. These simpler structures come with the cost of worse performance at higher frequencies, relatively inferior robustness to phase shifts and a state availability requirement. Therefore, they can be effectively used for relatively lower bandwidth applications where the states are measurable. The H infinity controller on the other hand operates quite well at higher, spatially varying frequencies despite having a limited output information. This can be first demonstrated by developing a centralized controller for an array consisting of a finite number of cantilevers in order to have a benchmark. Using infinite abstraction methods however a localized and spatially distributed controller on par with the centralized control can be developed for the infinite cantilever array. Instead of regarding only the cantilever tip as if the cantilever was a point mass the above results can be further verified by using a multimodal model of the cantilever system. The FEM model, as a typical multimodal method, views the cantilever as a more complex structure by cutting it into segments and taking the dynamics of each segment into calculation. Hence this methodology yields a more accurate idea about the control of high density microcantilever systems

Motion control and vibration suppression of flexible lumped systems via sensorless LQR control

This work attempts to achieve motion control along with vibration suppression of flexible systems by developing a sensorless closed loop LQR controller. Vibration suppression is used as a performance index that has to be minimized so that motion control is achieved with zero residual vibration. An estimation algorithm is combined with the regular LQR to develop sensorless motion and vibration controller that is capable of positioning multi degrees of freedom flexible system point of interest to a pre-specified target position with zero residual vibration. The validity of the proposed controller is verified experimentally by controlling a sensorless dynamical system with finite degrees of freedom through measurements taken from its actuator

Voltage analysis on MV/LV distribution networks with the integration of DC fast chargers

The development of ultra-low carbon emission electric vehicles (EVs) has been grown rapidly over the last years in response to the large share of greenhouse gas emissions contributed by the transportation sector. One of the main issues among EV drivers is range anxiety, which mainly results from the long charging battery durations. DC fast charging, the latest charging technology, aims to shorten charging duration; however, the success of e-mobility will be also related to the capacity of the distribution network to integrate the new EVs and their chargers. Specifically, the integration of EVs and DC fast chargers will increase the peak demand and may pose significant challenges for MV and LV distribution networks if adequate control measures are not implemented. This paper introduces a topology for the modelling and connection of a DC fast charger on a real MV/LV distribution network and ensures that the network operates within acceptable limits and that consumers connected to it are minimally affected. Simulation results show that DC fast chargers stress the LV distribution network by causing grid congestions; however, local voltage control measures and a vehicle-to-grid technology can improve some of the grid-side challenges

A cooperative-relational approach to digital libraries

Copyright @ 2007 Springer-Verlag, Berlin HeidelbergThis paper presents a novel approach to model-driven development of Digital Library (DL) systems. The overall idea is to allow Digital Library systems designers (e.g. information architects, librarians, domain experts) to easily design such systems by using a visual language. We designed a Domain Specific Visual Language for such a purpose and developed a framework supporting it; this framework helps designers by automatically generating code for the defined Digital Library system, so that they do not have to get involved into technical issues concerning its deployment. In our approach, both Human-Computer Interaction and Computer Supported Collaborative Work techniques are exploited when generating interfaces and services for the specific Digital Library domain

Oksipital Ensefalosel

Encephalocele is a neural tube defect characterized by sac-like protrusions of the brain and the covering membranes through an opening in the skull. Encephalocele is less common than other neural tube defects. In this case we presented a 21 years old 20 weeks pregnant woman with fetal occipital encephalocele accompanying lemon sign, normal posterior fossa imaging and normal level of maternal serum alpha-fetoprotein (MSAFP).Ensefalosel beyin dokusunun kafa tasındaki bir açıklıktan dışarıya çıkmasıdır. Ensefalosel diğer nöral tüp defektlerine kıyasla daha az yaygındır. Bizim vakada ultrason görüntelemesinde oksipital ensefalosele eşlik eden limon belirtisi ve normal bir posterior fossa izlenmekle birlikte, normal düzeyde maternal serum alfafetoproteini (MSAFP) olan 21 yaşındaki 20 haftalık gebe sunulmaktadır

Fleksibilni slijedni sustav s koncentriranim parametrima sa suzbijanjem vibracija korištenjem LQR-a bez senzora

This work attempts to achieve motion control along with vibration suppression of flexible systems by developing a sensorless closed loop LQR controller. Vibration suppression is used as a performance index that has to be minimized so that motion control is achieved with zero residual vibration. An estimation algorithm is combined with the regular LQR to develop sensorless motion and vibration controller that is capable of positioning multi degrees of freedom flexible system point of interest to a pre-specified target position with zero residual vibration. The validity of the proposed controller is verified experimentally by controlling a sensorless dynamical system with finite degrees of freedom through measurements taken from its actuator.U ovom radu opisan je fleksibilni slijedni sustav sa suzbijanjem vibracija upravljan LQR regulatorom u zatvorenom upravljačkom krugu bez senzora. Vibracije su korištene u težinskoj funkciji koja se minimizira s ciljem eliminiranja rezidualnih vibracija iz slijednog sustava. Kombinirajući algoritam estimacije s klasičnim LQRom, razvijen je regulator za upravljanje gibanjem i vibracijama bez korištenja senzora, koji je sposoban pozicionirati određenu točku fleksibilnog sustava s više stupnjeva slobode u predefiniranu željenu točku bez preostalih vibracija. Validacija predloženog regulatora provedena je eksperimentalno upravljajući dinamičkim sustavom s konačnim brojem stupnjeva slobode uz korištenje mjerenja s aktuatora

X-ray single phase LSGM at 1350 °C

Synthesis of X-ray-phase-pure (La1−xSrxGa1−yMgyO3−δ, LSGM, where x = 0.1, y = 0.15 and 0.17) powders were achieved at temperatures as low as 1350 °C via organic precursor method using tartaric acid as the carrier material. LSGM materials were characterized for their phase purity, crystallization and electrical properties. Pellets sintered at 1350 °C for 6 h were single phase and dense (>99%). Electron microscopy analysis of X-ray single-phase pellets revealed MgO precipitates with sizes ranging from 50–300 nm. Phase formation and distribution in this complicated multi-cation-oxide system as a function of temperature were reported and discussed. Amorphous LSGM first crystallizes at 625 °C. However, elimination of undesired phases require higher temperatures. Impedance measurements as a function of temperature up to 545 °C revealed that the X-ray phase pure pellets may have extrapolated ionic conductivity values as high as 0.14–0.16 S/cm at 800 °C. Possible implications of limited MgO solubility on the ionic conductivity are presented

Feasibility study and impacts of EV penetration in Rwanda's MV distribution networks

Road transport has been identified as one of the top contributors of greenhouse gas (GHG) emissions from the energy sector in Rwanda [1]. The Ministry of Environment in its Third National Communication Report to the United Nations Framework Convention on Climate Change proposed different mitigation solutions including the introduction of electric vehicles (EVs) and fuel efficiency systems. The main motivation is to replace diesel-fuelled cars with EVs starting from 2020 in Rwanda [1]. EVs are projected to replace 150,000 passenger cars by 2050 and according to the projection, these EVs will require an average of 30 kWh per 100 km [1]. In this paper, a feasibility study of introducing EVs in Rwanda’s transport system is investigated. Simulation results show that 1.5% of the registered private vehicles, 10% of the registered buses and 10% of the registered taxis charging at 10 kW can be replaced with EVs with a minimal impact on voltage profiles. This study found that 1%, 8% and 8% of the registered private vehicles, buses and taxis can be supported with 20 kW chargers. However, an addition of two large-scale distributed generation (DG) units is required with 20 kW chargers in the network